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Old 06-01-2013, 05:07 PM
Elroch Elroch is offline
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Default Re: Under-represented class data

kartikeya, you might be interested in a lecture segment from a different course on machine learning which relates to a key part of your question.

Error metrics for skewed classes

which deals with the interesting error-related quantities "precision" and "recall" in such scenarios.

Alternatively, if you can decide what the cost of an error of either type would be, you can simply modify your error function to weight errors of one type more than errors of the other when training. If the costs chosen are accurate, I can't see how you could do better.
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